/Engine/Source/Runtime/Engine/Classes/Engine/ActorChannel.h
Reads the header of the content block and instantiates the subobject if necessary
[UObject](API\Runtime\CoreUObject\UObject\UObject) * ReadContentBlockHeader ( [FInBunch](API\Runtime\Engine\Net\FInBunch) & Bunch, bool & bObjectDeleted, bool & bOutHasRepLayout )